• Summary
• Text account
• Data table and detailed info
• Distribution map
• Reference and further resources

Justification of Red List category
This species has a large range, and hence does not approach the thresholds for Vulnerable under the range size criterion (Extent of Occurrence under 20,000 km² combined with a declining or fluctuating range size, habitat extent/quality, or population size and a small number of locations or severe fragmentation). The population size has not been quantified, but it is not believed to approach the thresholds for Vulnerable under the population size criterion (under 10,000 mature individuals with a continuing decline estimated to be over 10% in ten years or three generations, or with a specified population structure). Despite the fact that the population trend appears to be decreasing, the decline is not believed to be sufficiently rapid to approach the thresholds for Vulnerable under the population trend criterion (over 30% decline over ten years or three generations). For these reasons the species is evaluated as Least Concern.

Population justification
The global population size has not been quantified, but this species is described as 'fairly common but patchily distributed' (Stotz et al. 1996). This species is suspected to be in decline owing to destruction of polylepis woodland, degradation of paramo and jalca grasslands and encroachment into polylepis woodland of more adaptable and dispersive bird species (del Hoyo et al. 1999).

Trend justification
This species is suspected to be in decline owing to destruction of polylepis woodland, degradation of paramo and jalca grasslands and encroachment into polylepis woodland of more adaptable and dispersive bird species (del Hoyo et al. 1999).

Text account compilers
Rutherford, C.A.

Recommended citation
BirdLife International (2024) Species factsheet: Blue-mantled Thornbill Chalcostigma stanleyi. Downloaded from https://datazone.birdlife.org/species/factsheet/blue-mantled-thornbill-chalcostigma-stanleyi on 26/12/2024.
Recommended citation for factsheets for more than one species: BirdLife International (2024) IUCN Red List for birds. Downloaded from https://datazone.birdlife.org/species/search on 26/12/2024.